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curious if you have thought about reporting the backup run data via means other than email. For example, this could submit JSON data via a webhook call to a centralized reporting structure - or submit webhook to slack etc. This would be helpful in the case of clients having data collection, reporting and alerting in place and would not rely on manual email checks.
(c)XSIBackup-DC is already able to submit data to a Syslog server, which in turn has bindings for almost anything you can think of.